Brushless direct-current motor high-performance speed measuring method

A brushed DC motor, high-performance technology, used in linear/angular velocity measurement, measurement device, velocity/acceleration/shock measurement, etc., and can solve problems such as limitations

Inactive Publication Date: 2014-08-20
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

An improved T speed measurement method updates the speed every time the three-phase Hall signal changes, but the measurement object is an integer number of cycles, which is not suitable for occasions where the motor speed changes rapidly; a fast and high-precision speed measurement method under stable speed conditions Calibrate the length of the three Hall signals during one revolution of the motor under test, and track the magnetic poles to accurately obtain the motor speed by using a small segment of the signal during the motor rotation process. This measurement method requires the motor to run at a stable speed for a period of time to work properly, limited in practical applications

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  • Brushless direct-current motor high-performance speed measuring method
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  • Brushless direct-current motor high-performance speed measuring method

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Embodiment Construction

[0016] Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but it is not intended to limit the present invention. according to figure 1 The application process implementation:

[0017] (1) Obtain the correction coefficient of the displacement in each Hall state.

[0018] In the open-loop state, the motor runs at a constant speed and direction, and the installation error of the three-phase Hall sensor causes the electrical angle of the motor to be different in each Hall state, such as figure 2 shown. When the Hall signal does not change, count the high-frequency clock signal until the Hall signal changes, read and save the count value of the motor in the previous Hall state, and then obtain the running time of the motor in each Hall state . Among them, the corresponding relationship between each Hall state and the count value is: three-phase Hall signal h a 、h b 、h c is "101", the count v...

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Abstract

The invention relates to a brushless direct-current motor high-performance speed measuring method suitable for speed measuring of brushless direct-current motors running in one direction or two directions. Firstly, the current work state of a motor is judged, the average rotation speed of the motor under each Hall state is calculated by modifying and compensating rotation displacement of the motor under each Hall state in the quick acceleration / deceleration process of the motor, and quickness of speed measuring is improved; when the motor rotates at a constant speed, the average rotation speed of the motor rotating one turn is calculated each time the Hall state is changed, and accuracy of speed measuring is optimized; two adjacent Hall states are compared, the rotation direction of the motor is judged, and two-way speed measuring is achieved; whether a currently obtained Hall signal is reasonable is analyzed according to two latest Hall states and the rotation direction of the motor, and anti-interference performance of the speed measuring method is improved. The method is suitable for speed measuring of the brushless motors running in one direction or two directions, and has accuracy, quickness and anti-interference performance of speed measuring.

Description

(1) Technical field [0001] The invention relates to a high-performance speed measurement method for a brushless direct current motor, in particular to a single and two-way Hall speed measurement method for the brushless direct current motor with anti-interference, rapidity and accuracy. (2) Background technology [0002] In engineering, brushless DC motors are usually required to run bidirectionally, with fast dynamic response and good steady-state characteristics. The bidirectional speed measurement method with high speed, high precision and high anti-interference is the prerequisite for the motor to have excellent speed regulation performance. Traditional software speed measurement methods include: M speed measurement method, T speed measurement method and M / T speed measurement method. The M speed measurement method is to calculate the speed by detecting the number of pulses within an equal time interval, which is suitable for measuring medium and high speed motors; the T ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/487
Inventor 王永郭旭
Owner BEIHANG UNIV
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